LibTest/collection/UnmodifiableMapView/containsKey_A01_t02.dart

// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/**
 * @assertion bool containsKey(Object key)
 * Returns [true] if this map contains the given [key].
 * Returns [true] if any of the keys in the map are equal to [key] according to
 * the equality used by the map.
 * @description Checks that [null] key is supported.
 * @author iarkh@unipro.ru
 */
import "dart:collection";
import "../../../Utils/expect.dart";

main() {
  UnmodifiableMapView view = new UnmodifiableMapView({});
  Expect.isFalse(view.containsKey(""));
  Expect.isFalse(view.containsKey(0));
  Expect.isFalse(view.containsKey(1));
  Expect.isFalse(view.containsKey(2));

  view = new UnmodifiableMapView({0 : 0, 1 : 4});
  Expect.isFalse(view.containsKey(""));
  Expect.isTrue(view.containsKey(0));
  Expect.isTrue(view.containsKey(1));
  Expect.isFalse(view.containsKey(2));
}